How do i make a certain player spawn at a certain spawn point?

You might want to try teleporting the player to a custom location once they spawn. Example:

player = --player you want teleported
location = Vector3.new(0,5,0)--Where you want them teleported
while not player.Character do wait() end --Wait for character to spawn
player.Character.PrimaryPart.CFrame = CFrame.new(location) --Teleport them

Doing it this way, you can set your own spawn points based on any number of factors.

Or adding a spawnpoint could be a way to do it without scripts